[AWS] Kubernetes on AWS

Key Points

• AWS EKS is a service that we can use to set up Kubernetes.

• The deployment.yaml file is used to specify how our pods should be created.

• The service.yaml file is used to specify how our pods are exposed.

deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-app
  labels:
    app: my-app
spec:
  replicas: 2
  selector:
    matchLabels:
      app: my-app
  template:
    metadata:
      labels:
        app: my-app
    spec:
      containers:
      - name: simple-node
        image: YOUR_DOCKER_HUB/simple-node
        ports:
        - containerPort: 80

 

service.yaml

apiVersion: v1
kind: Service
metadata:
  name: my-app
  labels:
    run: my-app
spec:
  ports:
  - port: 80
    protocol: TCP
  selector:
    run: my-app

 

Creating a Kubernetes Cluster on AWS

Creating an EKS Cluster

1. Create cluster in EKS
2. Create and specify role for Kubernetes cluster
3. Enable public access

Creating a Node Group

1. Add Node Group in the newly-created cluster
2. Create and specify role for IAM role for node group
3. Create and specify SSH key for node group
4. Set instance type to t3.micro for cost-savings as we learn how to use Kubernetes
5. Specify desired number of nodes

Docker images are loaded from the container registry into Kubernetes pods. Access to the pods are exposed to consumers through a service.